Professional indoor/outdoor speakers. An 8-inch, two-way system, the I/O 8 has the capacity to handle 100 watts of power and is operable between 65 to 18k Hz. The I/O 8 measures 20x10.6x10.2 (HxWxD) inches and weights 35 pounds. More info at this link http://mixonline.com/news/audio_community_io_io/